Front fork, frame and bicycle

Abstract

The utility model belongs to the technical field of bicycles, and discloses a front fork, a frame and a bicycle, the front fork comprises a front fork vertical pipe and two front fork legs, the front fork vertical pipe is provided with two mounting parts, and the two mounting parts are respectively welded with the two front fork legs; a first-level protrusion is arranged on the first one of the installation portion and the front fork leg in a protruding mode, a second-level protrusion is arranged on the first-level protrusion in a protruding mode, and the second one of the installation portion and the front fork leg is arranged on the second-level protrusion in a sleeved mode and connected with the first-level protrusion in an abutting mode, so that rapid positioning is achieved, and installation is convenient. The mounting part, the front fork leg and the first-stage protrusion jointly form a filler groove used for containing welding flux, so that when the mounting part and the front fork leg are connected in a welded mode, the welding flux can be contained in the filler groove, the mounting part and the front fork leg are fixedly connected, after welding, the welding flux outside the filler groove can be polished, the appearance of the front fork is neater, and the service life of the front fork is prolonged. And the strength of a connecting structure between the mounting part and the fork leg of the front fork is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to front forks, frames and bicycles. Background Technology

[0002] Existing technology provides a fork comprising a fork shoulder cap joint, a left fork leg, and a right fork leg. Both the left and right fork legs are connected to the fork shoulder cap joint. The connecting end of the fork shoulder cap joint has a positioning protrusion. The left and right fork legs are fitted onto the positioning protrusion and abut against the body of the fork shoulder cap joint, thereby achieving positioning and facilitating installation. Furthermore, both the left and right fork legs are fixedly connected to the fork shoulder cap joint by welding. After welding, the weld joints of the left and right fork legs and the fork shoulder cap joint will develop protrusions due to solder buildup, affecting their appearance. Grinding away these solder protrusions would compromise the structural strength of the connection between the left and right fork legs and the fork shoulder cap joint. Utility Model Content

[0003] According to one aspect of the present invention, the present invention provides a fork to solve the problem in the prior art that the welding joint between the fork leg and the fork shoulder cover joint will produce a protrusion due to the accumulation of solder, which affects the appearance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A fork, comprising a fork stem and two fork legs, wherein the fork stem has two mounting portions, and the two mounting portions are respectively welded to the two fork legs;

[0006] The mounting part and the first of the fork legs are provided with a primary protrusion, the primary protrusion is provided with a secondary protrusion, the second of the mounting part and the fork legs are sleeved on the secondary protrusion and abut against the primary protrusion, and the mounting part, the fork legs and the primary protrusion together form a filler groove for accommodating solder.

[0007] As a preferred embodiment of the fork, the fork steerer has a first cable pass-through hole for the cable harness to pass through, and at least one fork leg has a second cable pass-through hole for the cable harness to pass through, wherein the first cable pass-through hole and the second cable pass-through hole are in communication.

[0008] As a preferred embodiment of the fork, the fork steerer also has an inlet hole communicating with the first cable guide hole, the inlet hole being disposed on the side wall of the fork steerer; at least one fork leg also has an outlet hole communicating with the second cable guide hole, the outlet hole being disposed on the side wall of the fork leg.

[0009] As a preferred embodiment of the front fork, the inner wall of the end of the second of the mounting portion and the fork leg has an arc surface, and the arc surface is correspondingly provided with the outer wall of the secondary protrusion.

[0010] As a preferred embodiment of the fork, the fork steerer tube is integrally formed, and the fork steerer tube includes a first connecting section and a second connecting section connected to the first connecting section. The first connecting section connects two mounting parts at the same time, and the wall thickness of the first connecting section is greater than the wall thickness of the second connecting section.

[0011] As a preferred embodiment of the fork, both fork legs are integrally machined, and both fork legs are variable diameter tubes.

[0012] As a preferred embodiment of the fork, the fork leg includes a mounting section and an extension section connected to the mounting section. The mounting section is connected to the mounting part, and the extension direction of the mounting section forms an angle with the extension direction of the extension section.

[0013] As a preferred embodiment of the fork, the fork steerer has a tapered boss, which is disposed inside the head tube and is rotatably connected to the head tube via a bearing.

[0014] According to another aspect of the present invention, a frame is provided, including the aforementioned front fork, and also including a head tube, the front fork being connected to the head tube.

[0015] According to another aspect of the present invention, a bicycle is provided, including the aforementioned frame, and further including a front wheel assembly disposed between the two front fork legs.

[0016] The beneficial effects of this utility model are:

[0017] This utility model provides a fork, including a fork stem and two fork legs. The fork stem has two mounting portions, which are welded to the two fork legs respectively. A primary protrusion is provided on one of the mounting portions and one of the fork legs, and a secondary protrusion is provided on the primary protrusion. A second mounting portion and one of the fork legs are fitted onto the secondary protrusion and abut against the primary protrusion. This cooperation between the second mounting portion and the secondary protrusion facilitates quick positioning and installation. The mounting portions, fork legs, and primary protrusions together form a filler groove for accommodating solder. When the mounting portions and fork legs are welded together, the solder can be contained within the filler groove, thus fixing the mounting portions and fork legs in place. After welding, the solder outside the filler groove can be ground to make the fork cleaner without affecting the structural strength of the connection between the mounting portions and the fork legs.

[0018] This utility model also provides a frame, including the aforementioned front fork and a head tube. The front fork is connected to the head tube, and the mounting part of the front fork is welded to the fork legs. The solder can be contained in the filler groove, thereby fixing the mounting part to the fork legs. After welding, the solder outside the filler groove can be ground to make the appearance of the front fork cleaner without affecting the structural strength of the connection between the mounting part and the fork legs. This results in a clean appearance for the frame and the structural strength of the front fork meeting the requirements.

[0019] This utility model also provides a bicycle, including the frame described above, and a front wheel assembly disposed between the two front fork legs. The frame has a neat appearance, and the structural strength of the front fork meets the requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front fork structure in an embodiment of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the front fork steerer tube in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the front fork legs in an embodiment of this utility model.

[0024] In the picture:

[0025] 1. Front fork steerer tube; 11. Mounting section; 12. First cable guide hole; 121. Cable inlet hole; 13. Tapered boss; 14. First connecting section; 15. Second connecting section;

[0026] 2. Front fork legs; 21. Second cable guide hole; 211. Cable exit hole; 22. Mounting section; 23. Extension section; 24. Front fork pawl connector;

[0027] 31. Primary protrusion; 32. Secondary protrusion; 33. Filler groove; 34. Arc surface;

[0028] 4. Bearings;

[0029] 100. Car head tube. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Existing technology provides a fork comprising a fork shoulder cap joint, a left fork leg, and a right fork leg. Both the left and right fork legs are connected to the fork shoulder cap joint. The connecting end of the fork shoulder cap joint has a positioning protrusion. The left and right fork legs are fitted onto the positioning protrusion and abut against the body of the fork shoulder cap joint, thereby achieving positioning and facilitating installation. Furthermore, both the left and right fork legs are fixedly connected to the fork shoulder cap joint by welding. After welding, the weld joints of the left and right fork legs and the fork shoulder cap joint will develop protrusions due to solder buildup, affecting their appearance. Grinding away these solder protrusions would compromise the structural strength of the connection between the left and right fork legs and the fork shoulder cap joint.

[0035] In response, this embodiment provides a fork to solve the problem in the prior art where the weld joint between the fork legs and the fork shoulder cover will produce a bulge due to solder accumulation, affecting the appearance. This can be applied to the field of bicycle technology.

[0036] Reference Figures 1-4The fork includes a fork stem 1 and two fork legs 2. The fork stem 1 has two mounting parts 11, which are welded to the two fork legs 2 respectively. The first mounting part 11 and the fork leg 2 are provided with a primary protrusion 31, and the primary protrusion 31 is provided with a secondary protrusion 32. The second mounting part 11 and the fork leg 2 are fitted onto the secondary protrusion 32 and abut against the primary protrusion 31. Thus, quick positioning is achieved through the cooperation between the second mounting part 11 and the fork leg 2 and the secondary protrusion 32, which facilitates installation. The mounting part 11, the fork leg 2, and the first-stage protrusion 31 together form a filler groove 33 for accommodating solder. When the mounting part 11 and the fork leg 2 are welded together, the solder can be accommodated in the filler groove 33, thereby fixing the mounting part 11 and the fork leg 2 together. After welding, the solder outside the filler groove 33 can be ground to make the appearance of the fork cleaner without affecting the structural strength of the connection between the mounting part 11 and the fork leg 2.

[0037] This embodiment exemplarily provides a configuration where the mounting portion 11 has a primary protrusion 31, and the fork leg 2 is fitted onto the secondary protrusion 32 and abuts against the primary protrusion 31. In other embodiments, the primary protrusion 31 can also be provided on the fork leg 2, and the mounting portion 11 can be fitted onto the secondary protrusion 32 and abut against the primary protrusion 31.

[0038] Continue to refer to Figures 1-4 The fork steerer tube 1 has a first cable guide hole 12 for the cable harness to pass through, and at least one fork leg 2 has a second cable guide hole 21 for the cable harness to pass through. The first cable guide hole 12 and the second cable guide hole 21 are connected, so that the cable harness can pass through the first cable guide hole 12 and the second cable guide hole 21 in sequence, that is, adopting an internal cable routing form. The cable harness does not need to pass through the outside of the fork, which can further improve the cleanliness of the fork. The cable harness can be the connecting cable harness of the brake structure.

[0039] Continue to refer to Figures 1-4 The fork steerer tube 1 also has an inlet hole 121 communicating with the first cable passage hole 12, and the inlet hole 121 is disposed on the side wall of the fork steerer tube 1; at least one fork leg 2 also has an outlet hole 211 communicating with the second cable passage hole 21, and the outlet hole 211 is disposed on the side wall of the fork leg 2, so that the cable harness can enter the first cable passage hole 12 from the inlet hole 121, and after the cable harness passes through the first cable passage hole 12 and the second cable passage hole 21, it exits from the outlet hole 211.

[0040] Continue to refer to Figures 1-4The inner wall of the end of the mounting part 11 and the second of the fork legs 2 has an arc surface 34, which corresponds to the outer wall of the secondary protrusion 32. There is a certain gap between the arc surface 34 and the outer wall of the secondary protrusion 32, allowing them to fit together. In this embodiment, specifically, the inner wall of the end of the fork leg 2 has an arc surface 34. By setting the connection between the fork leg 2 and the secondary protrusion 32 as an arc surface 34, the force on the connection part can be evenly distributed, avoiding stress concentration.

[0041] Optionally, the ends of the fork legs 2 are manufactured using a tapering process, so that the diameter of the ends of the fork legs 2 is smaller than the diameter of the parts connected to them. The tapering process is a common manufacturing technique in the field of bicycle frame manufacturing; its specific principles and procedures will not be elaborated upon here.

[0042] Continue to refer to Figures 1-4 The fork steerer tube 1 is integrally formed. The fork steerer tube 1 includes a first connecting section 14 and a second connecting section 15 connected to the first connecting section 14. The first connecting section 14 connects two mounting parts 11. The wall thickness of the first connecting section 14 is greater than the wall thickness of the second connecting section 15. Since the first connecting section 14 needs to be connected to other structures, it requires higher structural strength. Therefore, this design can improve the structural strength of the first connecting section 14, while reducing the weight of the second connecting section 15, which has lower structural strength requirements. Specifically, the fork steerer tube 1 can be formed by forging and tube drawing. Forging and tube drawing are common processing techniques in the field of bicycle frame manufacturing; their specific principles and processes will not be elaborated here.

[0043] Continue to refer to Figures 1-4 Both fork legs 2 are integrally machined, and both fork legs 2 are reducing tubes, thus ensuring that the structural strength of different parts of the fork legs 2 is adapted to their structural strength requirements. Specifically, the fork legs 2 can be machined by drawing tubes, and after machining, they are subjected to reducing treatment so that the outer diameter of different parts of the fork legs 2 meets the design requirements.

[0044] Continue to refer to Figures 1-4 The front fork leg 2 includes a mounting section 22 and an extension section 23 connected to the mounting section 22. The mounting section 22 is connected to the mounting part 11, wherein an arc surface 34 is provided on the mounting section 22. The extension direction of the mounting section 22 forms an angle with the extension direction of the extension section 23. Specifically, the mounting section 22 extends to the outside of the front wheel assembly, and the extension section 23 extends downward, so that the overall arrangement structure of the front fork leg 2 is adapted to the mounting position of the front wheel assembly.

[0045] In this embodiment, the fork steerer 1 and the fork leg 2 are made of aluminum alloy. In other embodiments, the fork steerer 1 and the fork leg 2 may also be made of titanium alloy or carbon fiber.

[0046] Continue to refer to Figures 1-4 The fork steerer tube 1 has a tapered boss 13, which is installed inside the head tube 100. The tapered boss 13 is rotatably connected to the head tube 100 via a bearing 4, thereby connecting the fork to the head tube 100.

[0047] Optionally, the fork leg 2 is also provided with a fork hook connector 24, which is used to connect the hook.

[0048] This embodiment also provides a frame, which includes the aforementioned front fork and a head tube 100. The front fork is connected to the head tube 100. The mounting part 11 of the front fork is welded to the fork leg 2, and the solder can be contained in the filler groove 33, thereby fixing the mounting part 11 to the fork leg 2. After welding, the solder outside the filler groove 33 can be polished to make the appearance of the front fork cleaner without affecting the structural strength of the connection between the mounting part 11 and the fork leg 2, thus making the appearance of the frame clean and the structural strength of the front fork sufficient.

[0049] This embodiment also provides a bicycle, which includes the frame described above and a front wheel assembly disposed between the two front fork legs 2. The frame has a neat appearance and the structural strength of the front fork meets the requirements.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A front fork, characterized in that, It includes a fork steerer tube (1) and two fork legs (2), wherein the fork steerer tube (1) has two mounting parts (11), and the two mounting parts (11) are respectively welded to the two fork legs (2); The mounting part (11) and the fork leg (2) are provided with a first-level protrusion (31), the first-level protrusion (31) is provided with a second-level protrusion (32), the mounting part (11) and the fork leg (2) are fitted onto the second-level protrusion (32) and abut against the first-level protrusion (31), and the mounting part (11), the fork leg (2) and the first-level protrusion (31) together form a filler groove (33) for accommodating solder.

2. The fork according to claim 1, characterized in that, The fork steerer tube (1) has a first cable pass hole (12) for the cable harness to pass through, and at least one fork leg (2) has a second cable pass hole (21) for the cable harness to pass through, wherein the first cable pass hole (12) and the second cable pass hole (21) are connected.

3. The fork according to claim 2, characterized in that, The fork steerer tube (1) also has an inlet hole (121) communicating with the first cable passage hole (12), the inlet hole (121) being disposed on the side wall of the fork steerer tube (1); at least one fork leg (2) also has an outlet hole (211) communicating with the second cable passage hole (21), the outlet hole (211) being disposed on the side wall of the fork leg (2).

4. The fork according to claim 1, characterized in that, The inner wall of the end of the second of the mounting part (11) and the fork leg (2) has an arc surface (34), which is correspondingly provided with the outer wall of the secondary protrusion (32).

5. The fork according to claim 1, characterized in that, The fork steerer tube (1) is integrally formed. The fork steerer tube (1) includes a first connecting section (14) and a second connecting section (15) connected to the first connecting section (14). The first connecting section (14) connects to two mounting parts (11) at the same time. The wall thickness of the first connecting section (14) is greater than the wall thickness of the second connecting section (15).

6. The fork according to claim 1, characterized in that, Both fork legs (2) are integrally formed, and both fork legs (2) are variable diameter tubes.

7. The fork according to claim 6, characterized in that, The fork leg (2) includes a mounting section (22) and an extension section (23) connected to the mounting section (22). The mounting section (22) is connected to the mounting part (11), and the extension direction of the mounting section (22) forms an angle with the extension direction of the extension section (23).

8. The fork according to claim 1, characterized in that, The fork steerer tube (1) has a tapered boss (13) which is set inside the head tube (100) and is rotatably connected to the head tube (100) by a bearing (4).

9. A frame, characterized in that, The fork includes any one of claims 1-8, and also includes a head tube (100) to which the fork is connected.

10. A bicycle, characterized in that, The vehicle includes the frame as described in claim 9, and also includes a front wheel assembly disposed between the two front fork legs (2).

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